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Fri, 31 Oct 2025 18:50:26 -0400 (EDT) Date: Fri, 31 Oct 2025 15:50:23 -0700 From: Boris Burkov To: Mark Harmstone Cc: linux-btrfs@vger.kernel.org Subject: Re: [PATCH v4 01/16] btrfs: add definitions and constants for remap-tree Message-ID: References: <20251024181227.32228-1-mark@harmstone.com> <20251024181227.32228-2-mark@harmstone.com> Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251024181227.32228-2-mark@harmstone.com> On Fri, Oct 24, 2025 at 07:12:02PM +0100, Mark Harmstone wrote: > Add an incompat flag for the new remap-tree feature, and the constants > and definitions needed to support it. > > Signed-off-by: Mark Harmstone > Reviewed-by: Boris Burkov > --- > fs/btrfs/accessors.h | 3 +++ > fs/btrfs/locking.c | 1 + > fs/btrfs/sysfs.c | 2 ++ > fs/btrfs/tree-checker.c | 6 ++---- > fs/btrfs/tree-checker.h | 5 +++++ > fs/btrfs/volumes.c | 1 + > include/uapi/linux/btrfs.h | 1 + > include/uapi/linux/btrfs_tree.h | 12 ++++++++++++ > 8 files changed, 27 insertions(+), 4 deletions(-) > > diff --git a/fs/btrfs/accessors.h b/fs/btrfs/accessors.h > index 99b3ced12805..95a1ca8c099b 100644 > --- a/fs/btrfs/accessors.h > +++ b/fs/btrfs/accessors.h > @@ -1009,6 +1009,9 @@ BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_encryption, > BTRFS_SETGET_STACK_FUNCS(stack_verity_descriptor_size, > struct btrfs_verity_descriptor_item, size, 64); > > +BTRFS_SETGET_FUNCS(remap_address, struct btrfs_remap, address, 64); > +BTRFS_SETGET_STACK_FUNCS(stack_remap_address, struct btrfs_remap, address, 64); > + > /* Cast into the data area of the leaf. */ > #define btrfs_item_ptr(leaf, slot, type) \ > ((type *)(btrfs_item_nr_offset(leaf, 0) + btrfs_item_offset(leaf, slot))) > diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c > index 0035851d72b0..726e4d70f37c 100644 > --- a/fs/btrfs/locking.c > +++ b/fs/btrfs/locking.c > @@ -73,6 +73,7 @@ static struct btrfs_lockdep_keyset { > { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, DEFINE_NAME("free-space") }, > { .id = BTRFS_BLOCK_GROUP_TREE_OBJECTID, DEFINE_NAME("block-group") }, > { .id = BTRFS_RAID_STRIPE_TREE_OBJECTID, DEFINE_NAME("raid-stripe") }, > + { .id = BTRFS_REMAP_TREE_OBJECTID, DEFINE_NAME("remap-tree") }, > { .id = 0, DEFINE_NAME("tree") }, > }; > > diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c > index d66681ce2b3d..9e1ba524d26a 100644 > --- a/fs/btrfs/sysfs.c > +++ b/fs/btrfs/sysfs.c > @@ -291,6 +291,7 @@ BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE); > BTRFS_FEAT_ATTR_COMPAT_RO(block_group_tree, BLOCK_GROUP_TREE); > BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34); > BTRFS_FEAT_ATTR_INCOMPAT(simple_quota, SIMPLE_QUOTA); > +BTRFS_FEAT_ATTR_INCOMPAT(remap_tree, REMAP_TREE); > #ifdef CONFIG_BLK_DEV_ZONED > BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED); > #endif > @@ -325,6 +326,7 @@ static struct attribute *btrfs_supported_feature_attrs[] = { > BTRFS_FEAT_ATTR_PTR(raid1c34), > BTRFS_FEAT_ATTR_PTR(block_group_tree), > BTRFS_FEAT_ATTR_PTR(simple_quota), > + BTRFS_FEAT_ATTR_PTR(remap_tree), > #ifdef CONFIG_BLK_DEV_ZONED > BTRFS_FEAT_ATTR_PTR(zoned), > #endif > diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c > index 5684750ca7a6..af9a26844113 100644 > --- a/fs/btrfs/tree-checker.c > +++ b/fs/btrfs/tree-checker.c > @@ -913,12 +913,10 @@ int btrfs_check_chunk_valid(const struct btrfs_fs_info *fs_info, > length, btrfs_stripe_nr_to_offset(U32_MAX)); > return -EUCLEAN; > } > - if (unlikely(type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK | > - BTRFS_BLOCK_GROUP_PROFILE_MASK))) { > + if (unlikely(type & ~BTRFS_BLOCK_GROUP_VALID)) { > chunk_err(fs_info, leaf, chunk, logical, > "unrecognized chunk type: 0x%llx", > - ~(BTRFS_BLOCK_GROUP_TYPE_MASK | > - BTRFS_BLOCK_GROUP_PROFILE_MASK) & type); > + type & ~BTRFS_BLOCK_GROUP_VALID); > return -EUCLEAN; > } > > diff --git a/fs/btrfs/tree-checker.h b/fs/btrfs/tree-checker.h > index eb201f4ec3c7..833e2fd989eb 100644 > --- a/fs/btrfs/tree-checker.h > +++ b/fs/btrfs/tree-checker.h > @@ -57,6 +57,11 @@ enum btrfs_tree_block_status { > BTRFS_TREE_BLOCK_WRITTEN_NOT_SET, > }; > > + > +#define BTRFS_BLOCK_GROUP_VALID (BTRFS_BLOCK_GROUP_TYPE_MASK | \ > + BTRFS_BLOCK_GROUP_PROFILE_MASK | \ > + BTRFS_BLOCK_GROUP_REMAPPED) > + > /* > * Exported simply for btrfs-progs which wants to have the > * btrfs_tree_block_status return codes. > diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c > index 45d89b12025b..63e5a17f96f9 100644 > --- a/fs/btrfs/volumes.c > +++ b/fs/btrfs/volumes.c > @@ -231,6 +231,7 @@ void btrfs_describe_block_groups(u64 bg_flags, char *buf, u32 size_buf) > DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_DATA, "data"); > DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_SYSTEM, "system"); > DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_METADATA, "metadata"); > + DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_REMAPPED, "remapped"); > > DESCRIBE_FLAG(BTRFS_AVAIL_ALLOC_BIT_SINGLE, "single"); > for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) > diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h > index f40b300bd664..0763a23aeebc 100644 > --- a/include/uapi/linux/btrfs.h > +++ b/include/uapi/linux/btrfs.h > @@ -336,6 +336,7 @@ struct btrfs_ioctl_fs_info_args { > #define BTRFS_FEATURE_INCOMPAT_EXTENT_TREE_V2 (1ULL << 13) > #define BTRFS_FEATURE_INCOMPAT_RAID_STRIPE_TREE (1ULL << 14) > #define BTRFS_FEATURE_INCOMPAT_SIMPLE_QUOTA (1ULL << 16) > +#define BTRFS_FEATURE_INCOMPAT_REMAP_TREE (1ULL << 17) > > struct btrfs_ioctl_feature_flags { > __u64 compat_flags; > diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h > index fc29d273845d..4439d77a7252 100644 > --- a/include/uapi/linux/btrfs_tree.h > +++ b/include/uapi/linux/btrfs_tree.h > @@ -76,6 +76,9 @@ > /* Tracks RAID stripes in block groups. */ > #define BTRFS_RAID_STRIPE_TREE_OBJECTID 12ULL > > +/* Holds details of remapped addresses after relocation. */ > +#define BTRFS_REMAP_TREE_OBJECTID 13ULL > + > /* device stats in the device tree */ > #define BTRFS_DEV_STATS_OBJECTID 0ULL > > @@ -282,6 +285,10 @@ > > #define BTRFS_RAID_STRIPE_KEY 230 > > +#define BTRFS_IDENTITY_REMAP_KEY 234 > +#define BTRFS_REMAP_KEY 235 > +#define BTRFS_REMAP_BACKREF_KEY 236 > + > /* > * Records the overall state of the qgroups. > * There's only one instance of this key present, > @@ -1161,6 +1168,7 @@ struct btrfs_dev_replace_item { > #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8) > #define BTRFS_BLOCK_GROUP_RAID1C3 (1ULL << 9) > #define BTRFS_BLOCK_GROUP_RAID1C4 (1ULL << 10) > +#define BTRFS_BLOCK_GROUP_REMAPPED (1ULL << 11) > #define BTRFS_BLOCK_GROUP_RESERVED (BTRFS_AVAIL_ALLOC_BIT_SINGLE | \ > BTRFS_SPACE_INFO_GLOBAL_RSV) > > @@ -1323,4 +1331,8 @@ struct btrfs_verity_descriptor_item { > __u8 encryption; > } __attribute__ ((__packed__)); > > +struct btrfs_remap { > + __le64 address; > +} __attribute__ ((__packed__)); > + nit: I think this should probably be btrfs_remap_item not btrfs_remap, though I don't think that convention is totally universal. > #endif /* _BTRFS_CTREE_H_ */ > -- > 2.49.1 >